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Mervyn Johns averages 6.70 across 22 rated films as an actor, ahead of Guy Middleton at 6.52.
Dot size shows audience votes. Films below the source vote floor sit on the baseline.
| The Halfway House | 1944 | 6.5 | as Fortescue | as Rhys |
| The Captive Heart | 1946 | 6.4 | as Capt. Jim Grayson | as Pte. Evans |
| Doctor at Large | 1957 | 5.7 | as Major Porter | as Mr. Smith |