A Romulan science officer whose damaged vessel is aided by the Enterprise-D in 2368, and who plans to repay the help by destroying the Federation ship as it goes to warp.
Mirok appears in the fifth-season episode The Next Phase. His science vessel has suffered a catastrophic engine failure, and the Enterprise answers its distress call. Mirok is polite but guarded with the away team, because the accident was caused by a secret experiment: an interphase generator intended to let a cloaked ship pass through solid matter.
Geordi La Forge and Ro Laren, rendered invisible and intangible by the same device, overhear Mirok and a colleague arranging for a feedback pulse in the power transfer beam that will make the Enterprise explode when it engages its warp drive.
The plan fails when La Forge and Ro make themselves visible again and pass on the warning in time. Mirok was played by Thomas Kopache, the first of his many Star Trek roles.