diff --git a/multinet/.gitignore b/multinet/.gitignore
index 3858b05f6..43788342f 100644
--- a/multinet/.gitignore
+++ b/multinet/.gitignore
@@ -1,3 +1,6 @@
 data
 lighthouse
 validators
+trinity
+prysm
+lodestar
diff --git a/multinet/README.md b/multinet/README.md
index 246f8f065..1322f11c7 100644
--- a/multinet/README.md
+++ b/multinet/README.md
@@ -6,7 +6,7 @@ In general, follow the build instructions of `nim-beacon-chain` as documented in
 
 ### Prerequisites
 
-:warning: To build nimbus, you need to have `rocksdb` and `pcre` installed - see [../](main repo) for instructions.
+:warning: To build nimbus, you need to have the `go` compiler (for go-libp2p-daemon), `rocksdb` and `pcre` installed - see [../](main repo) for instructions.
 
 ```bash
 # Clone repo
@@ -38,6 +38,9 @@ cd multinet
 # Or do all in one step, with multitail
 USE_MULTITAIL=1 ./run_all.sh
 
+# The client scripts take optional arguments:
+# ./script.sh <start_validator_num> <number_of_validators> <total_validators>
+./run_nimbus.sh 0 20 40 # run nimbus with 20 validators, starting from 0, on a 40-validator network
 ```
 
 ## Diagnostics
diff --git a/multinet/make_genesis.sh b/multinet/make_genesis.sh
index 724f9ce25..e57c1ab2f 100755
--- a/multinet/make_genesis.sh
+++ b/multinet/make_genesis.sh
@@ -49,7 +49,7 @@ if [ ! -f "${SNAPSHOT_FILE}" ]; then
     --outputBootstrapNodes="${SIMULATION_DIR}/bootstrap_nodes.txt" \
     --bootstrapAddress=127.0.0.1 \
     --bootstrapPort=50000 \
-    --genesisOffset=10 # Delay in seconds
+    --genesisOffset=30 # Delay in seconds
 fi
 
 # Delete any leftover address files from a previous session
diff --git a/multinet/run_all.sh b/multinet/run_all.sh
index 051dbc5e4..5ed7c2411 100755
--- a/multinet/run_all.sh
+++ b/multinet/run_all.sh
@@ -1,11 +1,5 @@
 #!/bin/bash
 
-# Kill child processes on Ctrl-C by sending SIGTERM to the whole process group,
-# passing the negative PID of this shell instance to the "kill" command.
-# Trap and ignore SIGTERM, so we don't kill this process along with its children.
-trap '' SIGTERM
-trap 'kill -- -$$' SIGINT EXIT
-
 ./make_genesis.sh
 
 # multitail support
@@ -13,25 +7,23 @@ MULTITAIL="${MULTITAIL:-multitail}" # to allow overriding the program name
 USE_MULTITAIL="${USE_MULTITAIL:-no}" # make it an opt-in
 type "$MULTITAIL" &>/dev/null || USE_MULTITAIL="no"
 
-# Kill child processes on Ctrl-C by sending SIGTERM to the whole process group,
-# passing the negative PID of this shell instance to the "kill" command.
-# Trap and ignore SIGTERM, so we don't kill this process along with its children.
-if [ "$USE_MULTITAIL" = "no" ]; then
-  trap '' SIGTERM
-  trap 'kill -- -$$' SIGINT EXIT
-fi
-
 if [ "$USE_MULTITAIL" != "no" ]; then
   COMMANDS=()
   # "multitail" closes the corresponding panel when a command exits, so let's make sure it doesn't exit
   COMMANDS+=( " -cT ansi -t 'nimbus' -l './run_nimbus.sh 0; echo [node execution completed]; while true; do sleep 100; done'" )
   COMMANDS+=( " -cT ansi -t 'trinity' -l 'sleep 3; ./run_trinity.sh; echo [node execution completed]; while true; do sleep 100; done'" )
   COMMANDS+=( " -cT ansi -t 'lighthouse' -l 'sleep 3; ./run_lighthouse.sh; echo [node execution completed]; while true; do sleep 100; done'" )
+  COMMANDS+=( " -cT ansi -t 'prysm' -l 'sleep 3; ./run_prysm.sh; echo [node execution completed]; while true; do sleep 100; done'" )
+  COMMANDS+=( " -cT ansi -t 'lodestar' -l 'sleep 3; ./run_lodestar.sh; echo [node execution completed]; while true; do sleep 100; done'" )
   eval $MULTITAIL -s 3 -M 0 -x \"Multichain\" "${COMMANDS[@]}"
 else
+  trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
   ./run_nimbus.sh 0 &
   sleep 2
   ./run_trinity.sh &
   ./run_lighthouse.sh &
+  ./run_prysm.sh &
+  ./run_lodestar.sh &
   wait
 fi
diff --git a/multinet/run_lighthouse.sh b/multinet/run_lighthouse.sh
index a28789748..0748d75eb 100755
--- a/multinet/run_lighthouse.sh
+++ b/multinet/run_lighthouse.sh
@@ -1,12 +1,15 @@
 #!/bin/bash
 
-# Helper script for running a lighthouse node and connecting to the beacon node
-# that's set up by start.sh
-
 # https://github.com/sigp/lighthouse/blob/master/docs/interop.md
 
 set -eu
 
+VALIDATORS_START=${1:-0}
+VALIDATORS_NUM=${2:-5}
+VALIDATORS_TOTAL=${3:-25}
+
+SRCDIR=${LIGHTHOUSE_PATH:-"lighthouse"}
+
 echo Locating protoc...
 if ! command -v protoc; then
   MSG="protoc (the Google Protobuf compiler) is missing. Please install it manually"
@@ -34,38 +37,39 @@ if ! command -v protoc; then
   exit 1
 fi
 
-cargo_path=$(which cargo)
-[[ -x "$cargo_path" ]] || { echo "install rust first (https://rust-lang.org)"; exit 1; }
+command -v cargo > /dev/null || { echo "install rust first (https://rust-lang.org)"; exit 1; }
 
-LIGHTHOUSE=${LIGHTHOSE_PATH:-"lighthouse"}
-
-[[ -d "$LIGHTHOUSE" ]] || {
-  git clone https://github.com/sigp/lighthouse.git "$LIGHTHOUSE"
-  pushd "$LIGHTHOUSE"
+[[ -d "$SRCDIR" ]] || {
+  git clone https://github.com/sigp/lighthouse.git "$SRCDIR"
+  pushd "$SRCDIR"
   git checkout interop # temporary interop branch - will get merged soon I expect!
   cargo update
   popd
 }
 
-
-pushd "$LIGHTHOUSE"
+pushd "$SRCDIR"
 cargo build --release
 popd
 
 # Fetch genesis time, as set up by start.sh
-if command -v jq; then
-  genesis_time=$(jq '.genesis_time' data/state_snapshot.json)
+if command -v jq > /dev/null; then
+  GENESIS_TIME=$(jq '.genesis_time' data/state_snapshot.json)
 else
-  genesis_time=$(grep -oP '(?<=genesis_time": )\w+(?=,)' data/state_snapshot.json)
+  GENESIS_TIME=$(grep -oP '(?<=genesis_time": )\w+(?=,)' data/state_snapshot.json)
 fi
 
-echo Genesis time was $genesis_time
+echo Genesis time was $GENESIS_TIME
 
-cd "$LIGHTHOUSE/target/release"
+set -x
+trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
+cd "$SRCDIR/target/release"
 
 #$export RUST_LOG=libp2p=trace,multistream=trace,gossipsub=trace
 
 # fresh start!
 rm -rf ~/.lighthouse
 
-./beacon_node --libp2p-addresses="/ip4/127.0.0.1/tcp/50000" testnet --spec minimal quick 16 $genesis_time
+./beacon_node --libp2p-addresses="$(cat ../data/bootstrap_nodes.txt)" testnet --spec minimal quick $VALIDATORS_TOTAL $GENESIS_TIME &
+
+./validator_client testnet -b insecure $VALIDATORS_START $VALIDATORS_NUM
diff --git a/multinet/run_lodestar.sh b/multinet/run_lodestar.sh
new file mode 100755
index 000000000..3dd9f5342
--- /dev/null
+++ b/multinet/run_lodestar.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -eu
+
+VALIDATORS_START=${1:-5}
+VALIDATORS_NUM=${2:-5}
+VALIDATORS_TOTAL=${3:-25}
+
+SRCDIR=${LODESTAR_PATH:-"lodestar"}
+
+export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
+
+command -v nvm > /dev/null || { echo "install nvm first (https://github.com/nvm-sh/nvm#installation-and-update)"; exit 1; }
+
+# Install node 10 LTS
+echo Switching to node 10..
+nvm install 10 && nvm use 10
+
+[[ -d "$SRCDIR" ]] || {
+  git clone git@github.com:ChainSafe/lodestar.git "$SRCDIR"
+
+  pushd "$SRCDIR"
+
+  command -v yarn > /dev/null || { npm install --global yarn ; }
+
+  yarn install
+  npx lerna bootstrap
+
+  popd
+}
+
+set -x
+trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
+cd "$SRCDIR/packages/lodestar"
+
+# Start
+# -v is optional
+./bin/lodestar interop -p minimal --db l1 \
+  -q ../../../data/state_snapshot.ssz \
+  --multiaddrs "$(cat ../../../data/bootstrap_nodes.txt)" \
+  -r -v $VALIDATORS_START,$(($VALIDATORS_START+$VALIDATORS_NUM))
diff --git a/multinet/run_nimbus.sh b/multinet/run_nimbus.sh
index 2ac828689..ded7b9c4c 100755
--- a/multinet/run_nimbus.sh
+++ b/multinet/run_nimbus.sh
@@ -2,7 +2,12 @@
 
 set -eu
 
-. $(dirname $0)/vars.sh
+VALIDATORS_START=${1:-20}
+VALIDATORS_NUM=${2:-5}
+VALIDATORS_TOTAL=${3:-25}
+
+source "$(dirname "$0")/vars.sh"
+
 cd "$GIT_ROOT"
 
 DATA_DIR="${SIMULATION_DIR}/node-0"
@@ -15,17 +20,20 @@ if [ "${NAT:-}" == "1" ]; then
   NAT_FLAG="--nat:any"
 fi
 
-FIRST_VALIDATOR_IDX=$(( (NUM_VALIDATORS / ($NUM_NODES + $NUM_MISSING_NODES)) * $1 ))
-LAST_VALIDATOR_IDX=$(( (NUM_VALIDATORS / ($NUM_NODES + $NUM_MISSING_NODES)) * ($1 + 1) - 1 ))
-
 mkdir -p $DATA_DIR/validators
 rm -f $DATA_DIR/validators/*
 
 pushd $VALIDATORS_DIR >/dev/null
-  cp $(seq -s " " -f v%07g.privkey $FIRST_VALIDATOR_IDX $LAST_VALIDATOR_IDX) $DATA_DIR/validators
+  cp $(seq -s " " -f v%07g.privkey $VALIDATORS_START $(($VALIDATORS_START+$VALIDATORS_NUM-1))) $DATA_DIR/validators
 popd >/dev/null
 
-$BEACON_NODE_BIN \
+rm -rf "$DATA_DIR/dump"
+mkdir -p "$DATA_DIR/dump"
+
+set -x
+trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
+./env.sh $BEACON_NODE_BIN \
   --network:$NETWORK_METADATA_FILE \
   --dataDir:$DATA_DIR \
   --nodename:0 \
diff --git a/multinet/run_prysm.sh b/multinet/run_prysm.sh
new file mode 100755
index 000000000..250bc4f5e
--- /dev/null
+++ b/multinet/run_prysm.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -eu
+trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
+VALIDATORS_START=${1:-15}
+VALIDATORS_NUM=${2:-5}
+VALIDATORS_TOTAL=${3:-25}
+
+SRCDIR=${PRYSM_PATH:-"prysm"}
+
+command -v bazel > /dev/null || { echo "install bazel build tool first (https://docs.bazel.build/versions/master/install.html)"; exit 1; }
+command -v go > /dev/null || { echo "install go first (https://golang.org/doc/install)"; exit 1; }
+
+# This script assumes amd64. Prysm builds for other architectures, but keeping it simple
+# for this start script.
+OS=""
+if [[ "$OSTYPE" == "linux-gnu" ]]; then
+  OS+="linux_amd64"
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  OS+="darwin_amd64"
+else
+  # Windows builds do work, but it would make this script more complicated.
+  # Allowing for Mac and Linux only for the moment.
+  echo "Only Mac and Linux builds supported at this time"
+fi
+
+[[ -d "$SRCDIR" ]] || {
+  git clone git@github.com:prysmaticlabs/prysm.git "$SRCDIR"
+  pushd "$SRCDIR"
+  bazel build --define ssz=minimal //beacon-chain //validator
+  popd
+}
+
+set -x
+
+cd "$SRCDIR"
+
+"$(bazel info bazel-bin)/beacon-chain/${OS}_stripped/beacon-chain" \
+  --datadir /tmp/beacon \
+  --pprof --verbosity=debug \
+  --clear-db \
+  --bootstrap-node= \
+  --peer=$(cat ../data/bootstrap_nodes.txt) \
+  --interop-eth1data-votes \
+  --deposit-contract=0xD775140349E6A5D12524C6ccc3d6A1d4519D4029 \
+  --interop-genesis-state ../data/state_snapshot.ssz &
+
+sleep 3
+
+"$(bazel info bazel-bin)/validator/${OS}_pure_stripped/validator" \
+  --interop-start-index=$VALIDATORS_START \
+  --interop-num-validators=$VALIDATORS_NUM
diff --git a/multinet/run_trinity.sh b/multinet/run_trinity.sh
new file mode 100755
index 000000000..2dc3da9d1
--- /dev/null
+++ b/multinet/run_trinity.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -eu
+
+VALIDATORS_START=${1:-10}
+VALIDATORS_NUM=${2:-5}
+VALIDATORS_TOTAL=${3:-25}
+
+SRCDIR=${TRINITY_PATH:-"trinity"}
+
+command -v python3 > /dev/null || { echo "install python3 first (https://wiki.python.org/moin/BeginnersGuide/Download)"; exit 1; }
+
+[[ -d "$SRCDIR" ]] || {
+  git clone git@github.com:ethereum/trinity.git "$SRCDIR"
+  pushd "$SRCDIR"
+
+  git checkout interop # temporary interop branch - will get merged soon I expect!
+
+  python3 -m venv _ve
+
+  . _ve/bin/activate
+
+  pip install -e .[eth2-dev]
+  popd
+}
+
+set -x
+trap 'kill -9 -- -$$' SIGINT EXIT SIGTERM
+
+cd "$SRCDIR"
+
+. _ve/bin/activate
+
+rm -rf /tmp/bb
+
+VALIDATORS=$(seq $VALIDATORS_START $(($VALIDATORS_START+$VALIDATORS_NUM-1)) | paste -d ',' -s -)
+
+PYTHONWARNINGS=ignore::DeprecationWarning trinity-beacon \
+  -l DEBUG \
+  --trinity-root-dir /tmp/bb \
+  --beacon-nodekey='aaaaaaaa' \
+  --preferred_nodes="$(cat ../data/bootstrap_nodes.txt)" \
+  interop \
+  --validators $VALIDATORS \
+  --genesis-state-ssz-path ../data/state_snapshot.ssz
diff --git a/multinet/vars.sh b/multinet/vars.sh
index 1f6b9a6c8..1dba88b08 100644
--- a/multinet/vars.sh
+++ b/multinet/vars.sh
@@ -13,9 +13,9 @@ cd $(git rev-parse --show-toplevel)
 : ${GIT_ROOT:="$($PWD_CMD)"}
 cd - &>/dev/null
 
-NUM_VALIDATORS=${VALIDATORS:-16}
-NUM_NODES=${NODES:-3}
-NUM_MISSING_NODES=${MISSING_NODES:-1}
+NUM_VALIDATORS=${VALIDATORS:-25}
+NUM_NODES=${NODES:-1}
+NUM_MISSING_NODES=${MISSING_NODES:-2}
 
 SIMULATION_DIR="${SIM_ROOT}/data"
 VALIDATORS_DIR="${SIM_ROOT}/validators"