The Transformers (1984)

S2E12 The Master Builders

The Constructicons deceive Grapple and Hoist by pretending they have abandoned Megatron. They proceed to build a solar energy tower based on Grapple's idea, despite Optimus Prime's objections about the potential threat of it falling into Decepticon hands. As expected, the Constructicons ultimately turn on them, revealing their true intentions.