1. Always to the rescue.
2. Joey to the rescue.
3. Joey always comes to the rescue.
They are all possible utterances. The first two are not grammatically complete sentences; they feel more like exclamations and might be written with exclamation marks. (1) needs context to explain who or what is "always to the rescue".
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They are all possible utterances. The first two are not grammatically complete sentences; they feel more like exclamations and might be written with exclamation marks. (1) needs context to explain who or what is "always to the rescue".
#1 and #2 are fine as headlines or titles, but they are not complete sentences.
#3 is fine, and is a complete sentence.