The Transformers #158

Spike Witwicky takes Galen's place and is bonded with Cerebros, as well as with Fortress Maximus. The Targetmasters along with Fortress Maximus storm the Decepticons island base to rescue Buster, but the island turns into a huge rocket ship and heads into space. Fortress Maximus follows, but is shot and severely damaged, so Spike disengages from Cerebros and makes contact with Buster. Shockwave arrives to kill Spike, but Spike activates Fortress Maximus' weapons by radio and shoots down Shockwave, who appears to burn up in Earth's atmosphere. The rocket with Buster disappears into space.